/*
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const slugify = require('slugify');

/**
 * Slugifies string.
 *
 * @param {string|StringConstructor} str
 * @return {string}
 */
module.exports = (str) => {
  if (str instanceof String) {
    str = str.toString();
  } else if (typeof str !== 'string') {
    return '';
  }

  return slugify(str, {
    replacement: '-',
    remove: /[$*_+~.()'"!/\-:@?]+/g,
    lower: true,
  });
};
